Combined safety and throw-off mechanism.



C. F. ROOT.

COMBINED SAFETY AND THROW-OFF MECHANISM.

APPLICATION man MAR. 15. 1915. RENEWED res. 5.1911.

. m mm Patented May15,191?.

5 SHEETS-SHEET 1- v ROOT.

COMBINED SAFETY AND THROW-OFF MECHANISM. a riicmou FILED MAR. 15. 1915. RENEWED FEB. 5.71911.

' 2 g 9 Patented M3 15, 1917- w 3' 5 SHEETS-SHEET 2- C. F. ROOT.

COMBINED SAFETY AND THROW-OFF MECHANISM.

APPLiCATlON FILED MAR. 15. 1915. RENEWED FEB. -5. 1917.

1 ,226,259. Patented May 15, 1917.

5 SHEETS-SHEET 3.

WITNESSES: I INVENTOR 'c. F. ROOT COMBINED SAFETY AND THROW APPLICATION FILED MAR.I5|19I5 RENEWED FEB. 5. NH]- OFF MECHANISM.

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WITNESSES C. F. ROOT. COMBINED SAFETY AND THROW-OFF MECHANISM. APPLICATION FILED MAR. 15. 1915. RENEWED FEB. 5. I917. L%%6,%59

Patented May15,1917.

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Specification of Letters Patent.

Patented May 1L5, rear.

Application filed Has-ch 15, 1915, Serial 1H0. M tti. Renewed February 5, 1917. Serial No. M6346.

Yin al whom it may concern:

Be it known that I, CHARLEs F. Room, a citizen of the United States of America, residing at Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Combined Safety and Throw-Oil Mechanism, of which the following is a specification.

This invention relates to safety devices for machines equipped with a moving ele-. ment and an opposing element which are adapted to act and exert a pressure upon work interposed between said elements, the specific construction of the present invention being more particularly applicable for use in connection with the conventional type of job printing presses.

It is well known that the operation of machines of the class described are highly dangerous to the operators thereof because by reason of inadvertence, accident, mistake, or otherwise the operators fail to remove from between or interpose the hands or fingers between the elements and they are caught between the elements, injured, maimed and crushed by thepressure of the elements exerted thereon.

It is further well known that in the operation of machines having a moving or reciprocating element and an opposing element such as printing presses, punch presses, staying machines and the like, that the operator must place the hands or fingers between the elements many times in the course of a days operation for the purpose of placing therebetween work to be acted upon by the elements. i

To operate machines of the class described for performing the work for which they are adapted, economically, efliciently and to their maximum capacity, they must be run or speeded up so as to leave just sufiicient time for the operator to remove from and place the work between the work engaging elements. It is desirable therefore to provide automatic means operable by contact with the hands or fingers of-the operator to prevent injury thereto which is operable instantly without the exercise of any mental or physical efi'ortupon the part of the operator. 7

As the s pee ty or peed of he m ch ne i increased, the liability or danger of the operator of being injured is increasedas the operator must lntGllPOSl-E his hands or fingers between the work engaging elements oftener and the period of time is shortened in which the operator must place the work betweenand remove his hands and fingers from between the work engaging, elements, it is' v6o therefore of the utmost importance in the matter of safety of the operator and the ca- I pacity of the machine that the safety operating mechanism shall be automatically operable without any physical or mental efi'ortupon the part of the operator in ith'e event of 1118 hands or fingers being caught between the elements, such mechanism permitting the operator to speed up the machine'tozcorrespond with the ability of the operator to handle the work without fear of being-injured.

The primary. object of this invention is to provide controlling means for automatically controlling, checking and restricting the 75.

movement of the movable Work engaging element operable upon contact of the controlling means with the fingers or hands of the operator and so locating, arranging and constructing the controlling means that when the operator fails to remove his hands or fingers from between the elements or by inadvertence, accident or mistake or other.- wise the operators haIids or fingers are-interposed between the elements, that the controlling means will first contact with the fingers or hands ofthe operator thereby actuating the safety mechanism to prevent the work engaging element from completing its working movement in the direction ofthe opposing element leaving a pre-determined gap between the element of suflicient width to permit the operator to withdraw his hands or fingers from between the elements and without injury thereto or to permit the hand or fingers to remain therebetween without danger of injury.

Another objectis to provide a safety mechanism that can be manipulated by hand periodically at the will of the operator j to prevent the work engaging element from exerting a pressure upon the work and to provide manually operated means for continuou y ma n a n g said o k e ga g;

element inoperative if desired, thereby providing a single mechanism and what is designated in the printers art as a throw-off mechanism.

. A further object is to provide means of directly interlocking the driving meansQto the work engaging element for movement in unison and means to actuate the driving means to prevent it from driving the work engaging element directly but permitting it to transmit movement to the work engagmg element indirectly at a different ratio than that of the driving mechanism; said work engaging element being at all times connected to, controlled and governed by the drlving means therebyeliminating all jar, vibra-- tion, pounding or hammering of the parts due to the gravity thereof or. because of the actuation of the tended.

The preferable specific means employed .to obtain the objects above described comprise a toggle joint mechanism which directly connects a driving means to the movable. work engaging element, the joints of which are normally interlocked to drive the work parts for the purpose inengaging element to the end of its working movement in the direction of an opposing element and means provided with a controller to unlock the joints of the toggle mechanism, thereby limiting or restricting the travel of the work engaging elementso that it can not travel to the end of its working movement but at the same time by an indirect connection forcing the work engaging element to continuously travel forward slower than the driving means and limited or restricted in extent, thereby leaving a gap or opening between the work engaging elements and the opposing element, said means being automatically or manually operated when the controller is subjected to pressure or resistance.

These and other objects are attained by the mechanism illustrated in the accompanying drawing, in which:

Figure 1 is a side elevation of a conventional type of job press showing the combined safety and throw-ofi mechanism applied thereto, also showing position of the parts thereof when the work engaging element is at the end of its idle movement or about to commence its working movement.

Fig. 2 is a cross-sectional viewtaken on the line A A of Fig. 1.

' Fig. 3 is a side elevation of a conventional type of a job press showing the combined safety and throw-off mechanism applied thereto, also showing the position of the parts thereof when the work engaging element .is at the end of its working movement exerting, or about to exert, a pressure upon the wor Fig. 5 is a rear elevation of Figs. 1, 2 and 4, showing a part of the work engaging element (or bed) broken away to more clearly show the application of the combined safety and throw-off mechanism to the press.

Fig. 6 is a detail front view of the ar- Fig. 7 is a plan view of a toggle jointv mechanism showing it in locked position and attached to one of the driving links,

also showin a series of gear teeth formed on one of the toggle joint members, meshing with an actuating rack formed on the top of a standard that normally pivots and the locked position of the concentric stud on the main connecting shaft.

Fig. 8 is a side elevation of Fig. 1, showing a part of the driving link broken away.

Fig. 9 is a side elevation of Fig. 1 showing the unlocked position of the to gle members, and standard, also the positlon of the concentric stud of the main connecting shaft when the toggle mechanism is unlocked.

rangement of parts of the combined safety In the drawings, reference numerals 1 and 2 depict parts of a conventional type of a job press, 3 the oscillating bed or work engaging element, 4 the oscillating platen and 5 the driving shaft having disks 6 and 7 mounted thereon. The disks 6 and 7 carrying the usual crank pins 8 and 9 to which one end of the driving links 10 and 11 are connected. The opposite ends of the driving links are provided with slots 12. A shaft 13 is journaled in the work engaging element and is provided with reduced concentric or stud portions 14 and 15 which slidably engage the slotted ends of the driving links, thereby permitting the driving links to be actuated to impart a variable move ment to the'work engaging element.

The driving links are connected to the studs 14 and 15 of the shaft 13 through the medium of toggle mechanisms, both mechanisms being duplicates of each other, one of which is constructed as follows: A stud pin 16 is securely fastened to the driving links 10 by a pin 17 and a joint member 18 is pivotally mounted upon the projecting end of the stud pin, the other joint member 19 is fitted to the stud 14 and fastened thereto by a pin 20. j

The joint members18 .and 19 are pivotally joined by a pin 21.; A stop pin 22 is secured to the link 10 and provides a support and stop for the joint member 18 and it is prefnmate erably arranged and adapted to maintain the pin 21 above the axial line of the stud pin 16 and stud 14 or, in other words, slightly above dead center to permit the toggle joint to be unlocked or broken freely and easily.

When the pin 21 is substantially upon dead center with the stud pin 16 and stud 14, the toggle members are lockedand movement imparted directly to the work engaging element or bed by the driving links.

To provide means of unlocking the joint members, from direct and positive connection with the links and work engaging element and thereafter. indirectly transmit through the medium of one set of said joint members limited and restricted movement to r the work engaging element, during the time that the joint members are collapsing, as

is mounted in the usual manner upon a rock shaft 27 and is periodically rocked to and from the positions-shown in Figs. 1 and 3 by the cam roller 28 which is secured to the arm 29 and travels in the cam way 30, when movement is imparted to the disks 6 and 7.

A yoke-shaped controller 31 is pivotally mounted upon the platen to move between the work engaging element and platen and telescopes the platen when the work engaging element and platen are performing their work, as shown in Fig. 3. The controller carries a depending arm 32 having a slot 33 formed therein, the purpose of which will be described hereinafter. The mechanism for actuating the toggle mechanism to prevent thework engaging element from completing its-working movement is con-' structed as follows: Abracket 34 is preferably attached to the frame-work of the press and a rod 35 is journaled in the frame-work of the press and an end thereof passes through an aperture inthe bracket 34 and projects beyond. A T shaped lifting lever 36 carrying horizontally projecting pins 37 and 38 is pivotally secured to the bracket 34 by a pivot 39.

A lever bar 40 is pivotally mounted upon the projecting end of the rod 35' adjacent to the bracket 34 and is provided with feet 41 and 42 which bridge over and normally rest upon the horizontal pins 37 and 38. A coil spring 43 exerts its tension to hold the feet of the lever bar 40 in yielding contact with the pins. An L shaped bar 44 is pivotally mounted upon the projecting end of the rod 35 adjacent to the lever bar 40 and one end 45 engages the top thereof.

A coil spring 46 is attached to the bracket 34 and to. the L shaped bar and exerts a-tension to yieldingly hold the end 45 of the bar 44 in contact with the top of the lever 40. The end 47 of the L shaped bar is turned at right angles to the body portion alining with thepivoted pawl 48 and it is adapte to engage with the lip 49 thereof. The pawl 48 is proportioned to drop by gravity in contact with a stop pin 50. A ratchet bar 51 is pivotally connected to the standard 25 on one end and its opposite or free end is slidably supported upon a bearing block 52'.

A pin 53 is secured to the T lever and engages the slot 33 in the arm 32 of the controller, thereby connecting the controller to the mechanism for actuating the toggle mechanism and providing means of governing the pivotal movement of the controller. The operation of the invention is as follows:

When the work engaging element is about to commence its working movement as shown in Fig. 1, the driving links are di-. rectly connected to the work engaging element by the toggle mechanism and the spring 26' is exerting a pressure upon the standard 25 which in turn exerts a pressure upon the gear teeth 23 provided upon the joint member 19, forcing the toggle means to interlock for pressure upon work interare moved in unison as the standard is connected thereto through the medium of the rack 24 which meshes with the gear teeth 23. The free end of the pivoted bar 51 is supported and reciprocated upon the bearing block 52.

When the work engaging element is traveling on its working movement and the platen is being rocked to its lower position, as shown in Fig. 3, the pin 53 is traveling in the-slot 33 of the arm preferably maintaining the controller in substantially the position shown in Fig.1, until the work engaging element is about to act upon the work, then the pin 53 enters the part a of the slot 33 which permits the controller and platen to move in unison thereby leaving the contact piece 60 projecting beyond the face of' the platen in a position to first contact with any obstruction interposed between the bed and controller while the bed is completing its workiiig movement. The movement of the controller with relation to the movement of the platen can be varied by changing the contour of the slot 33. i

Fig. 1 shows the normal position of the parts of the job press and the parts of the combined throw-ofi' and safety mechanism when the work engaging element is at the end of its idle movement, or about to commence its working movement, and Fig. 3 shows the normal relation of the parts when the work engaging element is exerting a pressure upon the work or about to commence its idle stroke. The normal relation of the parts as shown in Fig. 1 and Fig. 3 remains the same unless the controller 31 meets with resistance or-an obstruction.

When, as shown in Fig. 4, the operators hand, fingers or other obstruction is inadvertently or otherwise left upon or caught between the controller and platen, the controller will first contact with the fingers or other obstruction and resist the movementof controller forcing it to pivot and exert a pressure upon the pin 53 thereby causing the T lever to rock upon its pivot 39 and force the pin 38 to contact with and lift bar 40 which in turn moves and presses against the end 45 of the bar 44, forcing the end 47 to disengage from the lip 49 of the pawl, the pawl then drops by gravity 4 engaging with or in a position to engage with the teeth 54 of the sliding bar 51.

When the pawl 48 engages the teeth 54 of the sliding bar 51, further movement of the bar and the standard 25 is prevented, both being held stationary. When the standard 25 is stopped as described, ,the rack 24 exerts a pressure upon the teeth 23 forcing the joint member to unlock and collapse, thereby disconnecting the driving links from directly imparting movement to the work engaging element and preventing it from completing its full workin movement, leavmg a gap or openlng etween the working engaging element and the opposing element, sufficient to permit the hand of the operator to be withdrawn from between the element and preventing injury thereto if left between the elements.

, When the joint members are unlocked, the driving links continue their movement or stroke sliding over the studs 14 and 15 which engage the slots 12, but impart no direct movement to the work engaging element but the links continue to impart an indirect but a limited or restricted movement to the work engaging element, through the medium of the joint members which are actuated by the links to impart movement thereto by the rack 23 and gear teeth 24.

Attention is called to the fact that the construction of the mechanism described is such that the driving links are always connected to the work engaging element whether they are driving it directly or indirectly, thereby controlling or governing the movement of the work engaging element when the toggle mechanism is locked or unlocked, preventing jarring, pounding 'vibration, etc., of the parts.

' released.

in Figs. 1 and 3. When the pawl is held in place by the end 47 of the bar 44, the end 58 of the pawl clears the teeth 54 of the sliding bar, permitting it to reciprocate thereunder Without engaging therewith, but in a position to engage the teeth when The teeth 54 of the sliding bar 51 are preferably arranged and located so as to engage the end of the pawl when it is released by the controller and. the work en-' gaging element is about four inches from the end of its working movement. The engagement of the pawl and the sliding bar with relation to the travel of the work engaging element can be varied by adding or increasing the number of teeth on the sliding bar or changing their location with reference to the end 58 of the pawl.

The ga or opening desired to be left between t e work engaging element when the toggle mechanism is unlocked can be varied by changing the dimensions of the toggle members from center to center of their bearings and by increasing or decreasing'the size or diameter of the gear teeth with relation to the rack.

It will be noted that the controller isdouble acting, that is, if the hands or fingers of the operator are left upon the platen, the controller will first contact with the fingers or hands of the operator and actuate the combined throw-off and safety mechanism in the same manner as described heretofore when the operators hands or fingers are projected between the work engaging element and the controller.

Attention is called to the fact that the operator at will can periodically resist the controller manually either in the direction of the platen or in the direction of the work engaging element, thereby actuating the toggle mechanism to throw oil the impression or limit the movement of the work engaging element in the direction of the platen.

If the operator desires to continually actuate the toggle mechanism to prevent the work engaging element from completing its working movement or prevent it making an impression on the work, a lever 59 is provided and turned in the path of the platen to contact therewith and resist theti vely connected the combinedgthrow-od work engaging element and an opposing and safety connectmg mechanism that the slightest resistance .or pressure will actuate the mechanism toperform ,the functions herein described.

The present inyentioncan be applied to machines of the class described which are now in use without altering or changing the parts thereof; f W What is claimed is:

1. In a combined safety and throw-ofi' mechanism for machines, having a movable work engaging element and an opposing element, driving means, means to connect 5 the driving means to the work engaging element to directly and continuously drive and force, same to complete its working movement toward the opposing element and exert a pressure upon work interposed between the; elements, and automatic means to actuate the connecting meansto prevent the work engaging element from completing its workin'gmovement, thereby leaving a gap between the elements, when an ob-I struction extraneous to the work is interposed between the elements. 4

2. In a combined safety and throw-0E mechanism for machines having a movable work engaging element and an opposing element, driving means, means to connect the driving means .to the work-engaging element to' directly and continuously drive and force same to complete its Working movement toward the opposing element and exert a pressure upon work interposed between the elements, means to actuate the connecting means to prevent'the work an gaging element from completing its work- 'ing movement thereby leaving a gap be tween the elements, when an obstruction extraneous to the work is interposed between the elements, and means on the connecting means to continuously impart a limited movement to the work engaging element after the connecting means is actuated to prevent the work engaging element from completing its working movement.

3. In a combined safety and throw-0E mechanism for machines havinga movable work engagingelement and an opposing element, driving means, means to connect the driving means to the work engaging-element .to directly and continuously drive and force same to complete its working movement under normal conditions, a controller pivotally mount ed upon the opposing elements, means to hold the controller in a predetermined position alined with the space between both elements,- and means to actuate the connecting means from the controller to render the connecting means inoperative when an obstruction extraneous to the work is encountered by the controller.

4. In a combined safety and throw-olfas mechanism for-machines having a movable iaaatef element, driving means, means to connect the driving means to the work-enga 'ng element to directly and continuously rive same to complete its working movement under normal conditions, a controller pivotally mounted upon the opposing element and dis osed in a predetermined position alined 'wit the space between both elements, means to actuate the connecting'means to render same inoperative, and means to operate the actuating means of the connecting means from the controller, whereby the connecting means is automatically moved to prevent the work engaging element from completing its working movement when the controller is resisted.

5. In a safety mechanism for machines having a movable work engaging element and an opposing element coiiperative to exert a pressure upon Work interposed between the elements, driving means, links connected to the driving means and slidably connected to the work engaging element, toggle mechanisms connecting the links to the Work engaging element, means to actuate the toggle mechanism to rigidly connect the same, and a controller connected to the actuating means of the toggle mechanisms and adapted to operate same when the controller is subjected to pressure.

6. In a combined safety and throw-ofi mechanism attachable to printing presses and analogous machines, which areequipped with opposing cooperative pressure elements, means to continuously reciprocate one of said elements and force the same to complete its cycle of movement under normal conditions, and means whereby the reciprocating means is automatically operated to prevent the reciprocating element from completing its normal cycle of movement to working position, thereby leaving an open-' ing between the pressure elements, when an obstruction extraneous to the work is interposed between the elements.

7. In a combined safety and throw-ofi' mechanism attachable to printing presses and analogous machines, which are equipped with opposing cooperative pressure ele ments, means ,to continuously reciprocate one of said elements and force same to complete its cycle of movement under normal conditions, means whereby the reciprocating means is automatically operated to prevent the reciprocating element from completing its cycle of movement, thereby leaving an opening between the pressure elements when an obstruction extraneous to the work is interposed between the elements, and means to sustain the parts so as to continuallyprevent the element from completing its cycle of movement during continued operation of the reciprocating means,

a 8. In a combined safetyand throw-off mechanism for machines equipped with a movable work'engaging element and an op posing element, driving means, links connected to the driving means and work engaging element to permit relative yielding movement of the work engaging element independent of the links, means to rigidly connect the links whereby to cause the work 10 engaging element to travel to the end of .its working movement and exert a pressure upon work interposed between the elements, and means automatically operable by engagement with an obstruction extraneous to the work to prevent the links from forcing the work engaging element to travel to the end of its working movement, thereby leaving a gap between the elements.

9. In a combined safety and throw off mechanism for machines equipped with a movable work engaging element and an opposing element, driving means, links connected to the driving means and work engaging element to permit relative yielding movement of the work engaging element independent of the links, means to rigidly connect the links whereby to cause the work engaging element to travel to the end of its working movement and exert a pressure upon work interposed between the elements,

and means operable by an obstruction extraneous to the work to prevent the links from moving the work engaging element to travel to the end of its working movement,

thereby leaving a gap between the elements.

10. A combined safety and throw off mechanism for machines equipped with a movable work engaging element and an opposing element, including driving means, a

toggle mechanism connected to the driving means and yieldingly connected to the work engaging element, means to prevent the toggle mechanism from yielding when the path of the work engaging element to the work is free, and means to permit the toggle mechanism to yield when said path is obstructed.

11. A combined safety and throw off mechanism for machines equipped with a movable work engaging element and an opposing element, including driving means links connected to the driving means and movably connected to the work engaging element, means to prevent the links from having a movement independent of the work engaging element, means to permit the links to have a movement independent of the work engaging element, and means to constantly impart indirect movement to the work engaging element.

12.- In a safety mechanism for machines equipped with cooperating pressure members, means for moving one of said members toward the other to act upon work interposed therebetween, and automatic means operable by an extraneous obstruction for limiting and restricting a continued movement of said movable pressure member toward the other thereby leaving a gap be-- tween the pressure members.

13. Ina safety mechanism for machines equipped with cooperating pressure members, means for continuously moving one of said members toward the other to act upon work interposed therebetween, and automatic means operable by contact with an extraneous obstruction to actuate said means for limiting and restricting, but not stopping the movement of said movable pressure member toward the other, thereby leaving 30 a gap between the pressure members.

14. In a safety mechanism for machines equipped with pressure applying members, 1 means forcontinuously moving one of the members toward and away from the other, 35 means for intermittently controlling the movable member to permitit to apply pressure upon interposed work and to prevent said movable mem er from moving to the end of its travel toward the other part, thereby'leaving a gap between the parts of the pressure applying means, and a con: troller alined with the space between the pressure applying means which is automatically operable to actuate the controlling means of the movable member upon being resisted. Y

15. In a safety mechanism for machinesequipped with pressure applying members, means for continuously moving one of the members toward and away from the other, and means for intermittently controlling the movable member to permit it to apply pressure upon interposed work and to prevent said movable member from moving to the end of its travel toward the other part, said controlling means being automatically operable by an extraneous obstruction thereby leaving a gap between the parts of the pressure applying'means.

16. In a safety mechanism for machines equipped with cooperating pressure members, links having a toggle mechanism as- 'sociated therewith and with one of said members to move said member toward and in juxtaposition to the other, and means to normally maintain the toggle mechanism in locked position automatically operable to unlock said toggle mechanism and limit the travel of the movable member toward the other upon interposition of an obstruction extraneous to the work.

17. In a safety mechanism for machines equipped with cooperating pressure members, links, a toggle mechanism associated with one of the members and links to move said member toward and inv juxtaposition to the other, means to normally maintain the toggle mechanism in locked position automatically operable to unlock said toggle Laaaeee mechanism and limit the travel of the movable member toward the other, and auxiliary means provided on the toggle mechanism to control and govern the movable member when the toggle mechanism is unlocked.

18. In a safety mechanism for machines equipped with cooperating pressure members, links, a toggle mechanism associated with one of the members and links to move said member toward and in juxtaposition to the other, means to normally maintain the toggle mechanism in locked position automatically operable to unlock said toggle mechanism and limit the travel of the movable member toward the other, and auxiliary means provided on the toggle mechanism to control and govern the movable member and also to impart a continuous but restricted movement toward the other member when the toggle mechanism is unlocked.

19. In a combined safety and throw-off mechanism for printing presses and analogous machines, in combination with the cooperating pressure elements thereof, means to continuously reciprocate one of the elements, means to control and govern the extent of the movement of the reciprocating "element toward the other, and means to actuate the controlling and governing means of the movable member and adapted for both automatic and manual operation.

20. In a safety mechanism for machines "equipped with a movable work engaging element and an opposing element, links, means for connecting the links to the work engaging element to normally and continu ously force the latter to travel to the end of its working stroke, means to actuate the link'connecting means to prevent the work engaging element from traveling to the end of its working stroke and a controller connected to the actuating means of the links for operating same either automatically upon encountering resistance or manually at will. V v

21. In combination with a pair of work engaging elements adapted to operate on work placed therebetween, and driving -means for continuously reciprocating one of the elements, means for preventing said elements from performing their operation on the work when an obstruction extraneous to the work is placed between said elements, and means in the work feeding path leading to the elements and operable by an obstruction to actuate the first means.

22. In combination with a pair of work engaging elements adapted to operate on work placed therebetween, and driving means for continuously reciprocating one of ments from performing their operation on the work when an obstruction extraneous to the work is placed between said elements, and a controller in the work feeding path leading to the elements and operable by an obstruction to actuate the first means.

23. In combination with a pair of work engaging elements adapted to operate on work placed therebetween, and driving means for continuously reciprocating one of the elements, means for preventing said elements from performing their operation on the work, and a controller adapted for either manual operation at will or automatic operation by an obstruction extraneous to the work and alined with the space between the elements for operating said first means. r 24. In combination with a pair of work engaging elements adapted to operate on work placed therebetween, and driving means for continuously reciprocating one of the elements, means for preventing said elements from performing their operation on the work during continuous movement of said driving means includin a device between the latter and the rec1procating element.

25.In combination with a pair of work engaging elements, means to continuously reciprocate one element operatively toward and from the other, and means associated with the reciprocating means and operable by an extraneousobstruction' to shorten the reciprocatory movement of the reciprocatory element thereby to prevent said reciprocated' CHARLES F. ROOT.

Witnesses:

JOHN H. Coss, PEARL M. YUuormR.

' the elements, means for preventing said ele- 

